EP0654334A1 - Method and apparatus for disaggregating plastic waste - Google Patents

Method and apparatus for disaggregating plastic waste Download PDF

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Publication number
EP0654334A1
EP0654334A1 EP94111103A EP94111103A EP0654334A1 EP 0654334 A1 EP0654334 A1 EP 0654334A1 EP 94111103 A EP94111103 A EP 94111103A EP 94111103 A EP94111103 A EP 94111103A EP 0654334 A1 EP0654334 A1 EP 0654334A1
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Prior art keywords
fraction
solids
melting
residue
dissolver
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EP94111103A
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German (de)
French (fr)
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EP0654334B1 (en
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Hans-Günter Vogel
Bert Haushofer
Werner Heep
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VEDAG GmbH
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VEDAG GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
    • B65G15/02—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration for conveying in a circular arc
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G2201/00—Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
    • B65G2201/04—Bulk

Definitions

  • the invention relates to a method for disintegrating shredded thermoplastic residues which contain textile fiber structures, metal foils and other solids which interfere with reuse.
  • thermoplastic residues For reuse, thermoplastic residues must be broken down to such an extent that the solids associated with them are present as a filler in the homogeneous mass. This is the only way to make high-quality products from this recycling material. B. by casting or extrusion.
  • Chips from thermoplastic materials with or without fillers can be used e.g. B. melt in melt mixers and homogenize. However, such a one-step digestion is not possible if the residues are connected to textile fiber structures, metal foils or coarse solids.
  • the method is effective but still complex because of the high wear of the expensive grinding tools. It is also difficult to control the uniformity of the solid unit.
  • thermoplastic waste chips connected with textile fiber structures, metal foils or / and granular minerals in a simple manner so that the solids are present in the mass in uniform fineness as fillers .
  • the object is achieved with a method in which the residue chips 12 are continuously poured into a melting vessel 1 and melted while stirring, the solids from Dissolver disks 2 and 4 are crushed at different speeds, and the melted mass is drawn off and separated in a separating device 8 into a residue fraction 7 with coarse solids and a clear-cut fraction 11 with fine solids, fraction 7 being returned to the melting vessel 1 and fraction 11 continuously discharged and replaced by adding residue chips 12 into the melting tank 1.
  • the melting tank When starting up the plant, the melting tank is preferably first filled to about a quarter and the mass, as soon as it is pumpable, is pumped over a heat exchanger while filling is continued in order to shorten the melting process.
  • the circuit is interrupted and the mass is passed over the separating device. From there, the process runs continuously.
  • a fill level measuring device in the melting vessel controls the supply of residual chips, so that these are melted in accordance with the amount of the discharged fraction.
  • a balance is established in the system between the circulated and the discharged solids. If fewer solids are discharged than are introduced into the system, the solids content of the mass in the melting tank increases and thus the shear rate. This results in an increased size reduction effect on the dissolver discs, which increases the amount of solids discharged again.
  • the main component of the device is a heatable melting vessel 1, in which dissolver disks 2 and 4 are arranged on shafts with different speeds so that the dissolver disks 2 of one shaft engage in the spaces between the dissolver disks 4 of the other well.
  • the boiler 1 is also provided with a filler neck for the residues 12, a neck for the circulating part of the mass, a fill level measuring device 10 for regulating the amount of residues 12 fed in and an outlet neck.
  • the outlet connection is connected via a pump 5 and a line, in which a heat exchanger 6 can also be integrated, to the separating device 8, which has a clear run outlet and a residue outlet.
  • the latter is connected via the pump 9 to the neck of the melting tank 1 for the part of the mass circulated.
  • a bypass for bypassing the separating device 8 is provided in the line to the melting tank 1 for starting.
  • a decanter centrifuge, a cyclone or a filter can be provided as the separation device.
  • a self-cleaning filter is preferred because it ensures a constant solid unit in the clear-cut fraction regardless of the density of the solids.
  • the pump 9 can be controlled via the filter pre-pressure.
  • the differential speed of the dissolver disk groups to one another is preferably 400 to 2500 rpm.
  • the dissolver disks on high-speed shafts can be arranged around those on a standing, slow-running or counter-rotating shaft.
  • the advantage of the invention lies in the fact that at the same time as the thermoplastic material is melted, the solids are comminuted to the desired fineness and an additional grinding process is thus saved. Wear is limited to the relatively inexpensive dissolver discs, and the fineness of the grinding is determined solely by the choice of the separating device. This ensures a constant digestion quality of the finished mass.
  • the heated melting tank 1 is equipped with six dissolver disks, which are arranged in the same way on two shafts with a nominal speed of 1 200 min ⁇ 1.
  • the distance between the set, sharp-edged teeth of discs 2 and 4 to each other is only 5 to 100 mm.
  • the residual chips 12 z. B. of bituminous roofing sheets with a glass fabric insert and a slate scatter in the melting tank 1 with rotating dissolver discs 2 and 4 and converted after a short time by supplying thermal and kinetic energy into a paste-like, pumpable mass.
  • the mass is transferred to the boiler 1 by means of the pump 5 via the heat exchanger 6 and the bypass pumped over until the boiler 1 is completely filled and the viscosity of the mass has dropped so far that it can be filtered.
  • the start-up process is considerably shortened by driving in a circuit with additional heat supply.
  • the mass is pumped through a continuously self-cleaning gap filter 8 with a gap width of 0.3 mm and the solids that have not yet been comminuted sufficiently are separated and enriched in the sump.
  • the separated residue fraction 7 is fed back into the melting tank 1 via the pump 9, the pump 9 being controlled via the admission pressure of the filter 8.
  • the filtrate fraction 11 is discharged and the loss due to the feeding of residual chips 12 into the boiler 1 is compensated for.
  • the dosage of the chips 12 is controlled by the level meter 10.
  • a further bypass 13 is provided to bypass the filter 8.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing Of Solid Wastes (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Disintegrating Or Milling (AREA)

Abstract

For continuously disaggregating thermoplastic waste containing fibrous and solid material, it is proposed to reduce the shredded waste during melting in a heatable vessel with dissolvers (high-speed stirrers), to divide the composition into a clear run with fine solids, which is discharged, and a residual fraction with coarse solids, which is returned into the melting vessel and is reduced again there.

Description

Die Erfindung betrifft ein Verfahren zum Aufschließen geschnitzelter thermoplastischer Reststoffe, die textile Fasergebilde, Metallfolien und andere bei der Wiederverwendung störenden Feststoffe enthalten.The invention relates to a method for disintegrating shredded thermoplastic residues which contain textile fiber structures, metal foils and other solids which interfere with reuse.

Für die Wiederverwendung müssen thermoplastische Reststoffe soweit aufgeschlossen werden, daß die mit ihnen verbundenen Feststoffe als Füllstoff in der homogenen Masse vorliegen. Nur so lassen sich hochwertige Produkte aus diesem Recyclingmaterial z. B. durch Gießen oder Extrudieren herstellen.For reuse, thermoplastic residues must be broken down to such an extent that the solids associated with them are present as a filler in the homogeneous mass. This is the only way to make high-quality products from this recycling material. B. by casting or extrusion.

Schnitzel aus thermoplastischen Kunststoffen mit oder ohne Füllstoffe lassen sich z. B. in Schmelzmischern aufschmelzen und homogenisieren. Ein solcher einstufiger Aufschluß ist jedoch nicht möglich, wenn die Reststoffe mit textilen Fasergebilden, Metallfolien oder groben Feststoffen verbunden sind.Chips from thermoplastic materials with or without fillers can be used e.g. B. melt in melt mixers and homogenize. However, such a one-step digestion is not possible if the residues are connected to textile fiber structures, metal foils or coarse solids.

Mit beheizten, diskontinuierlich betriebenen Knetern oder Dissolvern lassen sich textile Einlagen und teilweise auch andere Feststoffe in einem gewissen Umfang aufschließen; aber eine für Füllstoffe erforderliche Zerkleinerung wird nicht erreicht, da infolge der eingebrachten kinetischen Energie die Temperatur der Schmelze ansteigt und damit Viskosität und Schergefälle sinken. Ein hohes Schergefälle ist aber für die Zerkleinerung von Feststoffen in einer viskosen Flüssigkeit notwendig.With heated, discontinuously operated kneaders or dissolvers, textile inserts and to some extent also open up other solids to a certain extent; however, the size reduction required for fillers is not achieved since the temperature of the melt rises as a result of the kinetic energy introduced, and thus the viscosity and the shear rate decrease. A high shear gradient is necessary for the comminution of solids in a viscous liquid.

In der DE-A 41 28 014 wird vorgeschlagen, Schnitzel von bituminösen Dachbahnen diskontinuierlich in einem mit einem Dissolver ausgerüsteten, beheizbaren Kessel aufzuschmelzen und teilweise aufzuschließen. Die pumpfähige Masse soll dann so lange über ein Heißmahlaggregat geführt werden, bis die Feststoffe in gewünschter Feinheit vorliegen.In DE-A 41 28 014 it is proposed to melt and partially digest chips of bituminous roofing sheets discontinuously in a heatable boiler equipped with a dissolver. The pumpable mass should then be passed over a hot grinding unit until the solids are in the desired fineness.

Das Verfahren ist zwar wirkungsvoll aber doch aufwendig wegen der hohen Verschleißes der teuren Mahlwerkzeuge. Außerdem ist ein Kontrolle der Gleichmäßigkeit der Feststoffeinheit schwierig.The method is effective but still complex because of the high wear of the expensive grinding tools. It is also difficult to control the uniformity of the solid unit.

Es bestand daher die Aufgabe, ein Verfahren und eine Vorrichtung zu entwickeln, um thermoplastische Reststoffschnitzel, die mit textilen Fasergebilden, Metallfolien oder/und körnigen Mineralstoffen verbunden sind, in einfacher Weise so aufzuschließen, daß die Feststoffe in gleichmäßiger Feinheit als Füllstoff in der Masse vorliegen.It was therefore the task of developing a method and a device for digesting thermoplastic waste chips connected with textile fiber structures, metal foils or / and granular minerals in a simple manner so that the solids are present in the mass in uniform fineness as fillers .

Die Aufgabe wird mit einem Verfahren gelöst, bei dem die Reststoffschnitzel 12 kontinuierlich in einen Schmelzkessel 1 eingefüllt und unter Rühren aufgeschmolzen werden, die Feststoffe von Dissolverscheiben 2 und 4 mit unterschiedlichen Drehzahlen zerkleinert werden, und die geschmolzene Masse abgezogen und in einer Trennvorrichtung 8 in eine Rückstandsfraktion 7 mit groben Feststoffen und eine Klarlauffraktion 11 mit feinen Feststoffen aufgetrennt wird, wobei die Fraktion 7 in den Schmelzkessel 1 Zurückgeführt und die Fraktion 11 kontinuierlich ausgeschleust und durch Zugabe von Reststoffschnitzeln 12 in den Schmelzkessel 1 ersetzt wird.The object is achieved with a method in which the residue chips 12 are continuously poured into a melting vessel 1 and melted while stirring, the solids from Dissolver disks 2 and 4 are crushed at different speeds, and the melted mass is drawn off and separated in a separating device 8 into a residue fraction 7 with coarse solids and a clear-cut fraction 11 with fine solids, fraction 7 being returned to the melting vessel 1 and fraction 11 continuously discharged and replaced by adding residue chips 12 into the melting tank 1.

Beim Anfahren der Anlage wird der Schmelzkessel vorzugsweise zunächst etwa zu einem Viertel gefüllt und die Masse, sobald sie pumpfähig ist, unter Fortsetzung der Befüllung über einen Wärmeaustauscher umgepumpt, um den Aufschmelzvorgang zu verkürzen.When starting up the plant, the melting tank is preferably first filled to about a quarter and the mass, as soon as it is pumpable, is pumped over a heat exchanger while filling is continued in order to shorten the melting process.

Nachdem der Kessel gefüllt und sein Inhalt aufgeschmolzen ist, wird der Kreislauf unterbrochen und die Masse über die Trennvorrichtung geführt. Von da an läuft das Verfahren kontinuierlich. Eine Füllstandsmeßvorrichtung im Schmelzkessel steuert dabei die Zufuhr an Reststoffschnitzeln, so daß diese entsprechend der Menge der ausgeschleusten Fraktion aufgeschmolzen werden.After the kettle has been filled and its contents melted, the circuit is interrupted and the mass is passed over the separating device. From there, the process runs continuously. A fill level measuring device in the melting vessel controls the supply of residual chips, so that these are melted in accordance with the amount of the discharged fraction.

In der Anlage stellt sich ein Gleichgewicht zwischen den im Kreislauf geführten und den ausgeschleusten Feststoffen ein. Werden weniger Feststoffe ausgeschleust als in das System eingebracht, so erhöht sich der Feststoffgehalt der Masse im Schmelzkessel und damit das Schergefälle. Das hat einen erhöhten Zerkleinerungseffekt an den Dissolverscheiben zur Folge, wodurch die Menge der ausgeschleusten Feststoffe wieder zunimmt.A balance is established in the system between the circulated and the discharged solids. If fewer solids are discharged than are introduced into the system, the solids content of the mass in the melting tank increases and thus the shear rate. This results in an increased size reduction effect on the dissolver discs, which increases the amount of solids discharged again.

Hauptbestandteil der Vorrichtung ist ein beheizbarer Schmelzkessel 1, in dem Dissolverscheiben 2 und 4 auf Wellen mit unterschiedlichen Drehzahlen so angeordnet sind, daß die Dissolverscheiben 2 der einen Welle in die Zwischenräume der Dissolverscheiben 4 der anderen Well eingreifen. Der Kessel 1 ist außerdem mit einem Einfüllstutzen für die Reststoffschnitzel 12, einem Stutzen für den im Kreislauf geführten Teil der Masse, einer Füllstandsmeßvorrichtung 10 zur Regelung der eingespeisten Menge an Reststoffschnitzeln 12 und einem Auslaßstutzen versehen. Der Auslaßstutzen ist über eine Pumpe 5 und eine Leitung, in der noch ein Wärmeaustauscher 6 integriert sein kann, mit der Trennvorrichtung 8 verbunden, die einen Klarlaufaustritt und einen Rückstandsaustritt hat. Der letztere ist über die Pumpe 9 mit dem Stutzen des Schmelzkessels 1 für den im Kreislauf geführten Teil der Masse verbunden. Außerdem ist in der Leitung zum Schmelzkessel 1 für das Anfahren noch ein Bypaß zur Umgehung der Trennvorrichtung 8 vorgesehen.The main component of the device is a heatable melting vessel 1, in which dissolver disks 2 and 4 are arranged on shafts with different speeds so that the dissolver disks 2 of one shaft engage in the spaces between the dissolver disks 4 of the other well. The boiler 1 is also provided with a filler neck for the residues 12, a neck for the circulating part of the mass, a fill level measuring device 10 for regulating the amount of residues 12 fed in and an outlet neck. The outlet connection is connected via a pump 5 and a line, in which a heat exchanger 6 can also be integrated, to the separating device 8, which has a clear run outlet and a residue outlet. The latter is connected via the pump 9 to the neck of the melting tank 1 for the part of the mass circulated. In addition, a bypass for bypassing the separating device 8 is provided in the line to the melting tank 1 for starting.

Als Trennvorrichtung kann eine Dekanterzentrifuge, ein Zyklon oder ein Filter vorgesehen werden. Bevorzugt wird ein selbstreinigendes Filter, weil damit eine gleichbleibende Feststoffeinheit in der Klarlauffraktion unabhängig von der Dichte der Feststoffe erreicht wird. Dabei ist die Pumpe 9 über den Filtervordruck steuerbar.A decanter centrifuge, a cyclone or a filter can be provided as the separation device. A self-cleaning filter is preferred because it ensures a constant solid unit in the clear-cut fraction regardless of the density of the solids. The pump 9 can be controlled via the filter pre-pressure.

Die Differenzdrehzahl der Dissolverscheibengruppen zueinander beträgt vorzugsweise 400 bis 2 500 min⁻¹. Dabei können die Dissolverscheiben auf schnellaufenden Wellen um solche auf einer stehenden, langsam laufenden oder gegenläufigen Welle angeordnet sein.The differential speed of the dissolver disk groups to one another is preferably 400 to 2500 rpm. The dissolver disks on high-speed shafts can be arranged around those on a standing, slow-running or counter-rotating shaft.

Der Vorteil der Erfindung liegt darin, daß gleichzeitig mit dem Aufschmelzen des thermoplastischen Materials eine Zerkleinerung der Feststoffe bis zur gewünschten Feinheit stattfindet und damit ein zusätzlicher Mahlvorgang eingespart wird. Der Verschleiß ist auf die relativ preiswerten Dissolverscheiben beschränkt, und die Mahlfeinheit ist allein durch die Wahl der Trennvorrichtung festgelegt. Damit ist eine gleichbleibende Aufschlußgüte der fertigen Masse gesichert.The advantage of the invention lies in the fact that at the same time as the thermoplastic material is melted, the solids are comminuted to the desired fineness and an additional grinding process is thus saved. Wear is limited to the relatively inexpensive dissolver discs, and the fineness of the grinding is determined solely by the choice of the separating device. This ensures a constant digestion quality of the finished mass.

Die Erfindung wird anhand der Zeichnung näher erläutert. Der beheizte Schmelzkessel 1 ist mit sechs Dissolverscheiben ausgerüstet, die auf zwei Wellen mit einer Nenndrehzahl von 1 200 min⁻¹ in gleicher Weise angeordnet sind. Auf der Welle des mit einer Nenndrehzahl von 16 min⁻¹ umlaufenden Abstreifers 3 sind weitere sechs Dissolverscheiben 4 paarweise so angeordnet, daß sie die Dissolverscheiben 2 teilweise einschließen. Der Abstand zwischen den geschränkten, scharfkantigen Zähnen der Scheiben 2 und 4 zueinander beträgt dabei nur 5 bis 100 mm.The invention is explained in more detail with reference to the drawing. The heated melting tank 1 is equipped with six dissolver disks, which are arranged in the same way on two shafts with a nominal speed of 1 200 min⁻¹. On the shaft of the scraper 3 rotating at a nominal speed of 16 min⁻¹ another six dissolver disks 4 are arranged in pairs so that they partially enclose the dissolver disks 2. The distance between the set, sharp-edged teeth of discs 2 and 4 to each other is only 5 to 100 mm.

Im Anfahrzustand werden die Reststoffschnitzel 12 z. B. von bituminösen Dachbahnen mit einer Glasgewebeeinlage und einer Schieferabstreuung in den Schmelzkessel 1 bei umlaufenden Dissolverscheiben 2 und 4 eingespeist und durch Zufuhr von thermischer und kinetischer Energie nach kurzer Zeit in eine pastöse, pumpfähige Masse umgewandelt.In the start-up state, the residual chips 12 z. B. of bituminous roofing sheets with a glass fabric insert and a slate scatter in the melting tank 1 with rotating dissolver discs 2 and 4 and converted after a short time by supplying thermal and kinetic energy into a paste-like, pumpable mass.

Sobald der Kessel 1 zu etwa einem Viertel gefüllt ist, wird die Masse mittels der Pumpe 5 über den Wärmeaustauscher 6 und dem Bypaß zum Kessel 1 umgepumpt, bis der Kessel 1 vollständig gefüllt und die Viskosität der Masse soweit abgesunken ist, daß sie filtrierbar ist. Durch das Fahren im Kreislauf mit zusätzlicher Wärmezufuhr wird der Anfahrprozeß erheblich abgekürzt.As soon as about a quarter of the boiler 1 is filled, the mass is transferred to the boiler 1 by means of the pump 5 via the heat exchanger 6 and the bypass pumped over until the boiler 1 is completely filled and the viscosity of the mass has dropped so far that it can be filtered. The start-up process is considerably shortened by driving in a circuit with additional heat supply.

Nun wird die Masse über ein kontinuierlich selbstreinigendes Spaltfilter 8 mit einer Spaltweite von 0,3 mm gepumpt und die noch nicht ausreichend zerkleinerten Feststoffe abgeschieden und im Sumpf angereichert. Über die Pumpe 9 wird die abgetrennte Rückstandsfraktion 7 in den Schmelzkessel 1 zurückgeführt, wobei die Pumpe 9 über den Vordruck des Filters 8 gesteuert wird. Die Filtratfraktion 11 wird ausgeschleust und der Verlust durch Zuspeisung von Reststoffschnitzeln 12 in den Kessel 1 ausgeglichen. Die Dosierung der Schnitzel 12 wird dabei über den Füllstandsmesser 10 gesteuert.Now the mass is pumped through a continuously self-cleaning gap filter 8 with a gap width of 0.3 mm and the solids that have not yet been comminuted sufficiently are separated and enriched in the sump. The separated residue fraction 7 is fed back into the melting tank 1 via the pump 9, the pump 9 being controlled via the admission pressure of the filter 8. The filtrate fraction 11 is discharged and the loss due to the feeding of residual chips 12 into the boiler 1 is compensated for. The dosage of the chips 12 is controlled by the level meter 10.

Um den Schmelzkessel 1 leerfahren zu können, ist ein weiterer Bypaß 13 zur Umgehung des Filters 8 vorgesehen.In order to be able to run the melting boiler 1 empty, a further bypass 13 is provided to bypass the filter 8.

Claims (6)

Verfahren zum Aufschließen thermoplastischer Reststoffe durch Aufschmelzen der Reststoffschnitzel und Zerkleinern der damit verbundenen Feststoffe, dadurch gekennzeichnet, daß die Reststoffschnitzel (12) kontinuierlich in einen Schmelzkessel (1) eingefüllt und unter Rühren aufgeschmolzen werden, die Feststoffe von Dissolverscheiben (2, 4) mit unterschiedlichen Drehzahlen zerkleinert werden, und die geschmolzene Masse abgezogen und in einer Trennvorrichtung (8) in eine Rückstandsfraktion (7) mit groben Feststoffen und eine Klarlauffraktion (11) mit feinen Feststoffen aufgetrennt wird, wobei die Fraktion (7) in den Schmelzkessel (1) zurückgeführt und die Fraktion (11) kontinuierlich ausgeschleust und durch Zugabe von Reststoffschnitzeln (12) in den Schmelzkessel (1) ersetzt wird.Process for breaking up thermoplastic residues by melting the residues and comminuting the solids associated therewith, characterized in that the residues (12) are continuously poured into a melting vessel (1) and melted with stirring, the solids of dissolver disks (2, 4) with different Speeds are reduced, and the melted mass is drawn off and separated in a separating device (8) into a residue fraction (7) with coarse solids and a clear-cut fraction (11) with fine solids, the fraction (7) being returned to the melting tank (1) and the fraction (11) is continuously discharged and replaced by adding residue chips (12) to the melting tank (1). Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß beim Anfahren die pumpfähige Masse während des Einfüllens der Reststoffschnitzel (12) in den Schmelzkessel (1) über einen Wärmeaustauscher (6) umgepumpt wird.Method according to claim 1, characterized in that when starting up, the pumpable mass is pumped over a heat exchanger (6) while the residue chips (12) are being poured into the melting tank (1). Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die geschmolzene Masse durch Filtrieren in zwei Fraktionen (7, 11) zerlegt wird.Method according to claim 1 or 2, characterized in that the molten mass is broken down into two fractions (7, 11) by filtration. Vorrichtung zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß sie aus einem beheizbaren Schmelzkessel (1) mit auf Wellen angeordneten Dissolverscheiben (2, 4), einer Füllstandsmeßvorrichtung (10), Einfüll- und Auslaßstutzen besteht, wobei die Dissolverscheiben (2) der einen Welle in die Zwischenräume der Dissolverscheiben (4) der anderen Welle eingreifen, dessen Ablaßstutzen über eine Pumpe (5) mit einer Trennvorrichtung (8) verbunden ist, die mit einem Austritt für die Klarlauffraktion (11) und einem anderen für die Rückstandsfraktion (7) versehen ist, wobei der Austritt für die Rückstandsfraktion (7) über eine Pumpe (9) mit dem Schmelzkessel (1) verbunden ist.Device for carrying out the method according to one of claims 1 to 3 , characterized in that it consists of a heatable melting vessel (1) with dissolver disks (2, 4) arranged on shafts, a level measuring device (10), filler and outlet connections, the Dissolver disks (2) of one shaft engage in the spaces between the dissolver disks (4) of the other shaft, the outlet connection of which is connected via a pump (5) to a separating device (8) which has an outlet for the clear-running fraction (11) and another is provided for the residue fraction (7), the outlet for the residue fraction (7) being connected to the melting vessel (1) via a pump (9). Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß sich zwischen Pumpe (5) und Trennvorrichtung (8) ein Wärmeaustauscher (6) befindet und als Umgehung der Trennvorrichtung (8) ein Bypaß zum Schmelzkessel (1) installiert ist.Apparatus according to claim 4, characterized in that a heat exchanger (6) is located between the pump (5) and the separating device (8) and a bypass to the melting vessel (1) is installed as a bypass of the separating device (8). Vorrichtung nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß der Abstand der Zähne der Dissolverscheiben (2) zu denen der Dissolverscheiben (4) 5 bis 100 mm beträgt.Device according to claim 4 or 5, characterized in that the distance between the teeth of the dissolver disks (2) and those of the dissolver disks (4) is 5 to 100 mm.
EP94111103A 1993-10-30 1994-07-16 Method and apparatus for disaggregating plastic waste Expired - Lifetime EP0654334B1 (en)

Applications Claiming Priority (2)

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DE4337198 1993-10-30
DE4337198A DE4337198A1 (en) 1993-10-30 1993-10-30 Method and device for digesting thermoplastic residues

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EP0654334A1 true EP0654334A1 (en) 1995-05-24
EP0654334B1 EP0654334B1 (en) 1998-09-30

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JPS5456680A (en) * 1977-10-13 1979-05-07 Kouji Yuzuki Method of separing metal* rubber and plastic
JPS59159313A (en) * 1983-03-01 1984-09-08 Moruton Hanbai Kk Apparatus for melting treatment of foamed waste plastic
EP0483665A2 (en) * 1990-10-30 1992-05-06 Hoechst Aktiengesellschaft Processing of thermally stressed waste polyester
EP0605825A1 (en) * 1992-12-24 1994-07-13 Röhm GmbH Thermoplastic plastics moulding matter, process of manufacture and moulding made therefrom

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PATENT ABSTRACTS OF JAPAN vol. 9, no. 11 (M - 351) 18 January 1985 (1985-01-18) *

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DE59407002D1 (en) 1998-11-05
DE4337198A1 (en) 1995-05-04
ATE171665T1 (en) 1998-10-15

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